Patent application number | Description | Published |
20090081973 | Multi-slot power control for wireless transmission - Methods and apparatus are provided for controlling transmitted power in a wireless system. The method includes generating information to be transmitted as a series of signal bursts, with a time interval between successive signal bursts, controlling individually a power level of each of said signal bursts with a power control signal to provide output signal bursts to be transmitted, and asserting a new power value of the power control signal during the time interval preceding each signal burst. The wireless system can be a TDSCDMA wireless system, and the signal bursts can be uplink signal bursts. | 03-26-2009 |
20090196223 | TRANSMIT POWER CONTROLLER - A transmit power control system includes: an output power estimator for estimating a transmit power of a transmitter; and a transmit power controller responsive to the output power estimator and to compare this with a requested power in order to calculate a target power which takes account of errors within the transmit power control system, and to vary a gain of an amplifier in a transmit signal path so as to reduce an error between the transmit power of the amplifier and the requested power. | 08-06-2009 |
20120314784 | INTEGRATED CIRCUIT, WIRELESS COMMUNICATION UNIT AND METHOD FOR QUADRATURE POWER DETECTION - An integrated circuit for a wireless communication unit has a transmit power control system employing a quadrature (I/Q) based power detector having at least one reference path and at least one detector path. The integrated circuit includes: a first quadrature error determination module for determining a quadrature error of a transmit signal and a second quadrature error determination module for determining a quadrature error of a detector signal input to the at least one detector path; a first quadrature balancing module arranged to correct for quadrature error of the transmit signal and output a reference signal to the at least one reference path; a second quadrature balancing module arranged to correct for quadrature error of the reference signal input to the at least one reference path, and a third quadrature balancing module arranged to correct for quadrature error of the detector signal input from the at least one detector path. | 12-13-2012 |
20130009710 | RF AMPLIFIER MODULE, INTEGRATED CIRCUIT DEVICE, WIRELESS COMMUNICATION UNIT AND METHOD THEREFOR - A radio frequency (RF) amplifier module has a digitally controllable amplifier to receive a first biased signal, a further biased signal, and a digital control signal including a less significant bit (LSB) component and a more significant bit (MSB) component. The digitally controllable amplifier has an LSB module operating according to the first biased signal and the LSB component, and an MSB module operating according to the further biased signal and the MSB component. The RF amplifier module further has a biasing component to apply a first, operating DC bias voltage to the further biased signal when the digitally controllable amplifier operates in a higher gain mode and the MSB module outputs a load current component, and apply a second, higher DC bias voltage to the further biasing signal when the digitally controllable amplifier operates in a lower gain mode and the MSB module outputs the load current component. | 01-10-2013 |
20130027110 | SQUARING CIRCUIT, INTEGRATED CIRCUIT, WIRELESS COMMUNICATION UNIT AND METHOD THEREFOR - A squaring circuit has current mode triplet metal oxide semiconductor (MOS) devices, including a first MOS device, a second MOS device and a third MOS device each having a source operably coupled to a first current source; and a fourth MOS device, a fifth MOS device and a sixth MOS device each having a source operably coupled to a second current source. The drain of first and fourth MOS device is operably coupled to a first supply, the drain of second and fifth MOS device is operably coupled to a first differential output port and the drain of third and sixth MOS device is operably coupled to a second differential output port. The gate of first, second and sixth MOS device is connected to a first differential input port, and the gate of third, fourth and fifth MOS device is connected to a second differential input port. | 01-31-2013 |
20130142284 | PREDISTORTION CIRCUIT, WIRELESS COMMUNICATION UNIT AND METHOD FOR COEFFICIENT ESTIMATION - A predistortion circuit is for providing distortion correction in a presence of harmonics. The predistortion circuit includes an input for receiving a digital input signal; an output for providing a digital output signal to an up-conversion element that produces harmonic terms operably coupled to a non-linear device; and a processor operably coupled to an output of the non-linear device for receiving an output radio frequency signal therefrom and arranged to determine a digital correction to be applied to the digital input signal. The processor is further arranged to determine the digital correction that includes a plurality of in-phase and quadrature cross-terms of the digital input signal where terms of a same order have different co-efficients. | 06-06-2013 |
20130188675 | Power Detection Method and Related Communication Device - A communication device with a power detection scheme is disclosed. The communication device includes a transmitter for transmitting an RF signal, a demodulator for demodulating the RF signal by utilizing a phase-modulated (PM) signal provided from the transmitter to generate a demodulated signal, a loopback circuit coupled between the transmitter and the demodulator for transmitting the RF signal and the PM signal from the transmitter to the demodulator when the power detection scheme is enabled, and a power detector for detecting power of the demodulated signal. | 07-25-2013 |
20130217343 | WIRELESS COMMUNICATION UNIT, INTEGRATED CIRCUIT AND METHOD THEREFOR - A wireless communication unit is described that includes a transceiver; at least one antenna port operably coupled to the transceiver via at least one antenna switch; a radio frequency part of the transceiver that includes at least one tuneable radio frequency (RF) component; and a test signal generator for generating an RF test signal for receiver calibration. The radio frequency part includes a coupler located between the at least one tuneable RF component and the at least one antenna switch for coupling the RF test signal to or from the radio frequency part for calibration. | 08-22-2013 |
20140073272 | METHOD AND APPARATUS FOR CALIBRATING AN ENVELOPE TRACKING SYSTEM - A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (RF) transmitter module of a wireless communication unit. The method includes, within at least one signal processing module of the wireless communication unit, applying a training signal having an envelope that varies with time to an input of the RF transmitter module, receiving at least an indication of instantaneous output signal values for the power amplifier module in response to the training signal, calculating instantaneous gain values based at least partly on the received output power values, and adjusting a mapping function between an instantaneous envelope of a waveform signal to be amplified by the power amplifier module and the power amplifier module supply voltage to achieve a constant power amplifier module gain. | 03-13-2014 |
20140073273 | METHOD AND APPARATUS FOR CALIBRATING AN ENVELOPE TRACKING SYSTEM - A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (RF) transmitter module of a wireless communication unit. The method includes, within at least one signal processing module of the wireless communication unit: applying training signal having time-variant envelope to input of the RF transmitter module; receiving indication of instantaneous output signal value(s) for the power amplifier module in response to the training signal; and adjusting timing alignment between envelope tracking path of the envelope tracking system and transmit path of the RF transmitter module to align envelope tracking power amplifier module supply voltage to instantaneous envelope(s) of a waveform signal to be amplified by the power amplifier module, based at least partly on the received indication of the instantaneous output signal value(s) for the power amplifier module in response to the training signal. | 03-13-2014 |
20140084987 | SQUARING CIRCUIT, INTEGRATED CIRCUIT, WIRELESS COMMUNICATION UNIT AND METHOD THEREFOR - A squaring circuit has current mode triplet metal oxide semiconductor (MOS) devices, including a first MOS device, a second MOS device and a third MOS device each having a source operably coupled to a first current source; and a fourth MOS device, a fifth MOS device and a sixth MOS device each having a source operably coupled to a second current source. The drain of first and fourth MOS device is operably coupled to a first supply, the drain of second and fifth MOS device is operably coupled to a first differential output port and the drain of third and sixth MOS device is operably coupled to a second differential output port. The gate of first, second and sixth MOS device is connected to a first differential input port, and the gate of third, fourth and fifth MOS device is connected to a second differential input port. | 03-27-2014 |